list_attachments

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description is the only source of behavioral info. It only states the resource; it does not disclose whether the operation is read-only, what is returned, or any side effects. The unexplained 'YELLOW.' label adds ambiguity rather than transparency.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The definition is appropriately tiny and front-loaded. However 'YELLOW.' is an unexplained fragment that does not earn its place; without known tool conventions, it confuses more than it clarifies.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a one-parameter list operation, the essential call data is present and the prerequisite is stated. Yet without an annotations safety profile or output schema, the description should at least note that this lists metadata and that download_attachment is the sibling for retrieving content; that distinction is missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema only provides title/type, and description coverage is 0%. The description compensates by explaining that message_id is the numeric id from get_messages, which gives provenance and reduces ambiguity enough for the sole parameter.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description identifies the resource ('attachments') and scope ('belonging to one message'), and the tool name supplies the 'list' verb. However, the sentence is a noun phrase and does not explicitly differentiate from download_attachment, so it is clear but not fully explicit.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The parameter line tells the agent to obtain message_id from get_messages, establishing a prerequisite and a minimal usage context. But it does not say when to prefer this over download_attachment or any other sibling, nor when not to use it.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.